﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Drawing;
using System.Web.SessionState;
namespace AiXiu.WebSite
{
    /// <summary>
    /// YZM 的摘要说明
    /// </summary>
    public class YZM1 : IHttpHandler, IRequiresSessionState
    {

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "image/jpeg";//要输出的类型

            Bitmap img = new Bitmap(50, 20);//造空白图
            Graphics gr = Graphics.FromImage(img);//往哪个图上去绘制
            Font font = new Font("宋体", 12, FontStyle.Bold);//设置字体
            SolidBrush brush = new SolidBrush(Color.White);//设置刷子
            gr.FillRectangle(brush, 0, 0, 50, 20);//刷子绘制的形状
            brush.Color = Color.Red;//颜色

            string s = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
            string str = "";
            Random rand = new Random();//初始化随机数
            for (int i = 0; i < 4; i++)
            {
                int start = rand.Next(62); //生成一个随机的起始位置
                str += s.Substring(start, 1).ToString();
            }
            //需要继承接口
            context.Session["yanzheng"] = str;
            gr.DrawString(str, font, brush, 0, 0);//绘制完了图片了
                                                  //将图片保存，通过response响应流保存
            img.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}